at autozone an impact driver might cost you 20 bucks. I've had mine for years and used it on a lot of stuf. Just make sure you use the bit that fits best. There's usually a bit ass phillips and a more diamond shaped one. Just get the driver adjusted the direction you want it to go, put it on the screw, and beat that fucker with a hammer. You'll know when its loose, generally 3 or 4 good whacks and you'll be able to turn it with the handle of the impact.